i already said here there's no Official Apple anything!
it would cost me 3 macpros to travel to a Technical Support or a genius bar.
Did you read the article at Apple?
Apple has determined that a small number of MacBook Pro (15-inch, Mid 2010) computers may intermittently freeze or stop displaying video on the built-in display or on an external display connected to the MacBook Pro. In this situation, you may also see a restart warning message before the video is lost or the display turns black or gray.
Apple will service affected 15-inch MacBook Pro computers free of charge until three years from date of purchase. This worldwide Apple program does not extend the standard warranty coverage of the affected MacBook Pro.
i live in Iran, there's no technical support or such as the Apple announced they would change the logicboards with this issue free of charge, here.
If you can't get local support, call Apple or closest provider via phone and find out where it's best to SHIP the MacBook Pro to and whom will fix it under the special cirumstances explained in the article.
so my only chance is getting to the third part issue, if that's the case. what possible step could i take to avoiding the black screen?
You can't do anything on your own, the graphic chip is soldered to the logicboard, the entire logicboard is replaced usually.
Backup your files if possible or have someone do data recovery.
Call Apple and send the machine to them to have it fixes.
Wait for the return.
Apple was shipping and repairing computers via postal mail for decades before they opened their first store.
Make sure to insure it.
I just posted comment regarding this and need to let you know as well. Last week, Apple replace the said logic board MBP 15" mid-2010. TWO (2) day later, the screen went black again!
Q: did they replace the same logic board from another MBP or from the same faulty batch production just happened to be in stock on the shelf? Apple has been very good so no implied wrong doing.
Many people have reported that they had their logic boards replaced only to have them fail once again. You have a 90 day warranty for repairs so I would take your machine back and have the logic board replaced - again.
Thanks... I did that yesterday and none of them at Apple Genius knew anything about it, nor previous visit with Apple staff (seriously). Although I kindly pointed to them (without having to "tell a fish how to swim") of the directive issue that Apple acknowledged this in Oct 13th 2011 - well documentated. But... the ignore my "pointer" and also they CANNOT do anything UNTIL the test report tells them that there is a fault which happened last week when they finally agreed and believed me (albeit why my frequent visits with them and per history of notes against my device).